com.boylesoftware.cb2.util
Class UniqueIdGenerator

java.lang.Object
  com.boylesoftware.cb2.util.UniqueIdGenerator

public class UniqueIdGenerator

extends java.lang.Object

Generates sequence of unique ids, which can be used, for example, as session ids.

This implementation is thread-safe.

Version:

$Id: UniqueIdGenerator.java,v 1.1 2003/05/06 14:17:05 levahim Exp $

Author:

Lev Himmelfarb

Field Summary

protected java.security.MessageDigest	digest Digest used to postprocess new ids.
protected int	nBytes Number of bytes in the generated ids.
protected java.util.Random	random Random number generator.

Constructor Summary

UniqueIdGenerator()
Constructs and initializes a new generator for 16 bytes in the generated ids.

UniqueIdGenerator(int nBytes)
Constructs and initializes a new generator.

Method Summary

java.lang.String

next() Generates next id.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

nBytes

protected final int nBytes

Number of bytes in the generated ids.

random

protected final java.util.Random random

Random number generator.

digest

protected final java.security.MessageDigest digest

Digest used to postprocess new ids.

Constructor Detail

UniqueIdGenerator

public UniqueIdGenerator(int nBytes)

Constructs and initializes a new generator.

Parameters:

nBytes - number of bytes in the ids.

UniqueIdGenerator

public UniqueIdGenerator()

Constructs and initializes a new generator for 16 bytes in the generated ids.

Method Detail

next

public java.lang.String next()

Generates next id.

Returns:

the id.